Generation method for preamble symbol in physical frame

A preamble symbol and physical frame technology, applied in the direction of digital transmission system, electrical components, modulated carrier system, etc., can solve the problems of unsuitable coherent detection, no cyclic prefix, failure of receiving algorithm detection, etc., and achieve good timing synchronization performance, good Fractional frequency offset estimation performance, the effect of solving the performance degradation of frequency domain channel estimation

Active Publication Date: 2017-07-07
SHANGHAI NAT ENG RES CENT OF DIGITAL TELEVISION
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Problems solved by technology

[0009] The problem solved by the present invention is that in the current DVB_T2 standard and other standards, there is no cyclic prefix in the DVB_T2 time domain structure, which cannot be applied to coherent detection, and the preamble symbol has a low probability of failure in the detection of low-complexity receiving algorithms under complex frequency selective fading channels. question

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  • Generation method for preamble symbol in physical frame
  • Generation method for preamble symbol in physical frame
  • Generation method for preamble symbol in physical frame

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Embodiment Construction

[0029] The inventors found that in the current DVB_T2 standard and other standards, there is no cyclic prefix in the DVB_T2 time domain structure, and there is a problem of failure probability in the low-complexity reception algorithm detection of the preamble symbols in the frequency selective fading channel.

[0030] In view of the above problems, the inventor provides a method for generating a leading symbol in a physical frame after research. A cyclic prefix is ​​set in the time domain structure, which solves the problem of channel estimation performance degradation in the frequency domain, and uses all or part of the data segment of the cyclic prefix to generate a modulated signal, so that the generated preamble symbols have good small frequency offset and timing synchronization performance. Further, it is ensured that the receiving end can still process the received signal within the range of the carrier frequency deviation from -500kHz to 500kHz.

[0031] In order to m...

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Abstract

The invention discloses a generation method for a preamble symbol in a physical frame. The generation method comprises that a time-domain OFDM symbol is obtained; the length of a cyclic prefix is determined; a time-domain OFDM symbol in the cyclic-prefix length is cut from the time-domain OFDM symbol and serves as the cyclic prefix; a modulation signal is generated according to the cut time-domain OFDM symbol in the cyclic-prefix length; and the preamble symbol is generated on the basis of the cyclic prefix, the time-domain OFDM symbol and the modulation signal. On the premise that the length of the modulation signal is determined, different initial positions are selected from the part, used for cutting the cyclic prefix, of the time-domain OFDM symbol to transmit signaling information on the basis of the length of the modulation signal. The generation method of the invention can be used to solve the problems that a DVB_T2 time-domain structure in DVB_T2 and other standards at present cannot adapt to coherent detection due to lack of a cyclic prefix, and that detection via a low-complexity reception algorithm may cause failure when the preamble symbol is in a complex frequency selective fading channel.

Description

[0001] This application is a divisional application of the original application, the application number of the original application is 201410184919.0, the application date is May 4, 2014, and the invention name is "Method for generating leading symbols in physical frames". technical field [0002] The invention relates to the technical field of wireless broadcast communication, in particular to a method for generating a leading symbol in a physical frame. Background technique [0003] Generally, in order for the receiving end of the OFDM system to correctly demodulate the data sent by the sending end, the OFDM system must realize accurate and reliable time synchronization between the sending end and the receiving end. At the same time, since the OFDM system is very sensitive to the frequency offset of the carrier, the receiving end of the OFDM system also needs to provide an accurate and efficient carrier spectrum estimation method to accurately estimate and correct the carri...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L5/00H04L27/26
CPCH04L5/0083H04L27/2602H04L27/2628H04L27/2692
Inventor 张文军黄戈邢观斌
Owner SHANGHAI NAT ENG RES CENT OF DIGITAL TELEVISION
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